Effect of degenerate E 11ν mode in H 01ν mode cavity on the measurement of complex permittivity
Effect of degenerate E 11ν mode in H 01ν mode cavity on the measurement of complex permittivity
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H 01ν 模腔简并 E 11ν 模对复介电常数测量的影响
DOI：
10.1049/piee.1967.0197
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发表时间：
1967
期刊：
影响因子：
--
通讯作者：
C. Aron
中科院分区：
文献类型：
--
作者：
C. Aron
本文讨论了用谐振法测量材料的相对介电常数和损耗角（tan δ）。所用的谐振腔是一个圆柱形腔，其中的主模激发是H01ν。每个样品的横截面具有等于腔的内半径的半径，并且测量是在样品厚度范围从一个波长到波长的一小部分的情况下进行的。使用Bleaney描述的类型的腔的顶面中的圆形耦合孔，2发现，在所考虑的样品厚度范围内，测量的介电常数和tan δ显示出周期性变化，总扩展分别为2%和42%。理论分析表明，这种特殊类型的耦合也激发了简并的E11ν模，这至少部分地解释了材料参数的测量变化。另一种类型的耦合，通过小槽切割在弯曲的侧面的腔，进行了描述，这将提供更好的歧视对E11ν模式，并导致测量这是较少依赖于样品的厚度。实验证明了这一点，并在测量中使用新的耦合安排的变化表明，对于相同的样品厚度范围内，在介电常数和tan δ的0.2和12%，分别蔓延。
The paper discusses measurements of the relative permittivity and the loss angle (tan δ) of a material using the resonance method. The resonator used was a cylindrical cavity in which the dominant-mode excitation was H01ν. The cross-section of each sample had a radius equal to the internal radius of the cavity, and the measurements were made with sample thicknesses ranging from one wavelength to a small fraction of a wavelength. Using circular coupling holes in the top surface of the cavity of the type described by Bleaney,2 it was found that, over the range of sample thicknesses considered, the measured permittivity and tan δ showed a periodic variation, the total spread being 2% and 42%, respectively. Theoretical analysis shows that this particular type of coupling also excites the degenerate E11νmode, and this accounts, at least partially, for the measured variation in the parameters of the material. An alternative type of coupling, through small slots cut in the curved sides of the cavity, is described, and this should give better discrimination against the E11νmode and lead to measurements which are less dependent on the sample thickness. Experiments are described which bear this out, and variations in the measurements using the new coupling arrangement show, for the same sample-thickness range, a spread in permittivity and tan δ of 0.2 and 12%, respectively.